Can-heading machine



J. BRENZINGER.

CAN HEADING MACHINE.

APPLICATION FILED DEC-9, 191a.

Patented Feb.'22, 192I..

4 SHEETSSHEET I.

J. BRENZINGERQ Patented Feb. 22, 1921.

4 SHEETS-SHEET 2.

J. BRENZINGER.

CAN HEADING MACHINE.

APPLICATION FILED DEC-9,1918.

Patented Feb.- 22, 1921.

4 SHEETSSHEET 3.

J. BRENZINGER.

CAN HEADING MACHINE.

APPLICATION FILED DEC-$1918.

Patented Feb. 22, 1921.

8 nvemtoz operated by hand.

November 10, 1917,

who s'rarss n'rar oFFicE.

JULIUS nngenzmenn, or ramrmrn, oomvnormur, assrenon ro 'rnn'max ms macnmin ea, or Barnenroa'r, oonnnerrour, A CORPORATION or new Yoax.

CAN-HEADIN G MACHINE.

Application filed December To all whom it may concern Be it known that I, J ULIUS Bnnnainone, a citizen of the United States, reslding at Fairfield, in the county of Fa1rfield and State of Connecticut, have invented certain new and useful Improvements in Can-Heading Machines, of which the following-is a specification.

This invention relates generally to can heading machines, with more particular reference to machines primarily adapted to be In a co-pending ap lication, filed by me erial No. 201,270, I have shown and described a hand-operated can heading Ithachine-although possessing some important features which doubtless might just as successfully be applled to an automatic machine--and in my earlier application I explained in detail the uses and essentials of such a machine. The present invention still more particularly contemplates further improvements in the machine of my earlier application aforesaid.

As is well known in this art, the seaming rollers of the most extensively used types of can heading machines are relatively adjusted and operated to perform the seaming operation in a given number of revolutionseither of the rollers around the stationarily supported can parts or of the supported can parts relative to the rollersand after completion of the seaming operation the rollers are withdrawn from the headed can in order to permit the removal of the latter from the seaming mechanism and the positioning of assembled can parts for the next suc ceeding heading. operation. Thereupon, the rollers are returned to effectively operative positions.

In power driven or so-called automatic machines, withdrawal and return of the roll-- ers is properly timed without the necessity for the exercise of any mental effort on part of the operator. It will be apparent, however, that in connection with a machine designed and adapted to be operated by hand, such as that shown and described in my earlier application aforesaid, the operator must note the positions of the seaming rollers with respect to the chuck, in order that the headed can may be removed and another work unit positioned while the rollers are at maximum distances from the chuck. If

the operator possesses a fair degree of skill,

Specification of Letters Patent;

Patented Feb. 22, 1921. 9, 1918. Serial No. 265,855.

this withdrawing and replacing operation may be readily performed without stop ing the machine; if he is unskilled, the mac ine may be momentarily stopped. In either case, this necessity for the exercise of close attention and judgment has a decided tendency to curtail both the effectiveness of the operator and the output capacity of the may Chum. In the absenceof close attention and good udgment, the operator is very likely to attempt withdrawal of the headed can prematurely, before the rollers have' been retracted a sufiicient distance from the chuck to permit of ready removal of the headed can, or he is just as likely to continue revolution of said rollers until they have started upon their return movement toward the chuck and ap roachv the latter closelyenough to inter ere with the can withdrawlngTand positioning operations.

he principal object of the present invention is the provision of means-primarily in connection with a hand-operated machine, substantially such as shown and described by me in my co-pending application aforesaidfor automatically controlling the tim ing of the retracting and returning move merits of the seaming rollers, thereby eiiminatlng the necessity for constant close attention by the operator to the positions of signed to enhance the convenience, simplic-' ity, effectiveness, durability and dependability of a machine of the character set forth, as will appear from the following description.

My invention will be more readily understood by reference to the accompanying drawings, forming a part of this specification, in which I have shown a practlcal and convenient embodiment of the invention and in which Figure 1 is a front elevation, partly in section; the seaming rollers being in what may be termed normal, open or inefi'ectively operatlng positions;

Fig. 2 is a vertical transverse section, taken substantially on the line 2-2 of Fig. 1;

Fig. 3 is a top plan View;

stantially on the line 44 of Fig. 1';

Fig. 5 is a view similar to Fig.4, but with the handleand ratchet in the positions taken immediately following the seamlng operation and prior to withdrawal of the rollers to their maximum retractedpositions, and

Fi 6 is a vertical section taken substantlally on the line 6-6 of Fig.

Referring now to the drawlngs in detail, I have shown therein a frame which comprises the vertical rods orposts 11 and 12 and the cross-bars or braces 13 and 14. The cross-bar 13 is provided at one end w 1th a horizontal arm or plate 15 to which is secured the base 16 of the bracket or standard 17 in which is journaled the main driving shaft 18. At the outer end of this shaft 18 is mounted the crank-wheel 19 which, while provided with the usual handle 20, for hand operation, I have also shown 1n the form of a grooved pulley whereby, if desired, wellknown connections may be made with any suitable source of power. The strength and rigidity of the frame is augmented by elongating the rod or post 11 and providing an upper cross-bar or brace 21 between the upper end of the rod or post 11 and the upper end of the bracket 17.

The chuck 22, which receives the can head and supports the assembled can parts during the seaming operation, is mounted at the lower end of the shaft 23. This shaft 23 is rotatively supported by the COIIlblIlGd spur and bevel gear 24 keyed to the upper end thereof which rests upon the hub 25 of a mutilated ratchet 26 (and upon the upper end of the sleeve 27 to which said ratchet is keyed). The ratchet 26, in turn, is supported from the cross-bar or brace 13 through the interposition of what for the.

time being I shall call a collar 28. At the inner end of the shaft 18 is mounted the bevel gear 29 the teeth of which are in mesh with the teeth of the beveled portion of the gear 24, wherefore, as will be apparent, the chuck-shaft 23--and therewith the chuck 22will be relatively slowly rotated upon rotation of the wheel 19.

The sleeve 27 is suitably journaled in the cross-bar or brace 13 and is rotatively supported from the chuck 22, preferably through the interposition of a well-known form of anti-friction device, asshown. At the lower end of the sleeve 27 is provided the circular eccentric-head 30 upon which is journaled the disk 31. This disk 31 carries the seaming rollers 32 and 33. The manner in which these rollers are mounted and the operation thereof upon relative rotation between the shaft 23 and the sleeve 27 is clearly shown and described in my copending application aforesaid, the seaming mechanism of the machine of which is identical to the seaming mechanism of the machine of this application, and in greater detail in my prior Patent No. 1,167,346, taken in connection with another prior Patent, No. 1,167,347, both granted to .me January 4, 1916. For the purposes of this description, therefore, itwill suffice to state that upon relative rotation between the shaft 23 and the sleeve 27 the seaming rollers are reciprocated to and from effectively coiiperative positional relationshipv with the chuck 22 to successively perform a seaming operation.

As hereinbefore suggested relative rotary movement between the rollers 32 and 33 and the chuck 22, with the parts in such effectively cooperative ositional relationship, must be continue throughout what has the effect of bein a certain number of revolutions of said rol lers around the chuck in order tocomplete hermetic seam between the head or cover and the body portion of the can, after which continued operation for a certain period is necessary in order to 3 withdraw the rollers for the removal-of the headed can and the positioningof assembled parts to be seamed, and to return the rollers to effectively operating relative positions. It is now desired to insure against the pos- 9 sibility of either excessively prolonging or curtailing this continued operation in an efl'ort to determine when the rollers are at proper distances from the chuck to permit of ready removal of the headed can and 9 substitution of assembled parts to be seamed-certainly a most desirable feature when the machine is operated by hand, and doubtless an absolutely essential feature when the machine is power-driven. I At the lower ends of the rods or posts 11 and 12, below the cross-bar 14, is mountedpreferably in a manner which'will be hereinafter described-what may be termed a combined gear-box andsupporting plate 34. 1 J ournaled in a bearing-block 35 on the earbox 34 and in an arm 36 projecting rom the cross-bar 13 is the vertical shaft 37. This shaft 37 is relatively rapidly driven with relation to the chuck-shaft 23 by means 1 of the pinion 38 the teeth of which are in mesh with the teeth of the spur portion of the gear 24. On the shaft 37 below the pinion 38, is mounted the eccentric 39 on which is journaled the collar 40 carrying the pawl l 41. These parts are so located and adjusted that the pawl 41 is adaptedto engage the teeth of the mutilated ratchet 26. It will be apparent that upon rotation of the shaft 37 the eccentric 39 will effect reciprocation of 1" the pawl-41 to rotate the ratchet-wheel 26 in a step-by-step movement throughout the toothed portion thereof.

As has been explained, the mutilated ratchet 26 is keyed to the sleeve 27, and it 1 will now be apparent that upon rotation of the driving shaft 18 the chuck-shaft 23 will be relatively rapidly rotated in one direction and the sleeve 27 on said shaft relatively slowly rotated in the opposite direction. In 1 precisely the same manner as that described in my co-pending application and my earlier patents, aforesaid, rotation of these parts eifect not only relatively rotary movement between the chuck-supported can parts and positions, but relatively slowly enough to entail the loss of considerable time, in' the aggregate.

It is my purpose not only to check the seaming rollers against return movement when they have been withdrawn to maximum distances from the chuck, and thus provide as much timeas may be desired or is necessary to remove the headed can and position a new work unit, but also to provide means for more rapidly restablishin effectively cooperative positional relations ip between rollers and chuck for the next succeeding seaming operation. For this purpose, the part to which I have hereinbefore referred as the collar 28, instead of being annular, is in the form of a closed yoke at the, end of an arm or lever 42 projecting to accessible position in front of the machine. The arms of the yoke embraceand are rotatable on the sleeve 27, and are of such length as to permit of slight longitudinal movement of the lever 42 as well as rotation thereof. On the lower face of the ratchet 26 is mounted an open ring 58, providing a notch 59 adapted to be engaged by a lug 60 on the upper face of the lever 42, whereby movement of said lever from the position indicated in Fig. 5 to the position indicated in dotted lines in Fig. 4, with the lug 60in the notch 59, will rotate the ratchet 26 in the same direction through a corresponding are and thus rapidly return the rollers to effectively opera-- tive ositions. I have shown the end 61 of the ring 59 beveled or tapered, and the con tiguous side of the lug 6O correspondingly beveled or tapered, whereby the manual forces applied tosaid lever to return the same to initial position also operate to disengage said lug from the notch to permit of such return without the necessity for the application of specially directed forces.

The teeth of the mutilated ratchet 26 extend throughout an arc of just sufficient length to effect rotation of the sleeve 27 by the pawl 41 during the predetermined number of revolutions of the shaft 23 deemed to be requisite to complete the seaming operation and long enough thereafter to withdraw the rollers to maximum distances from the chuck. The parts' are now in the relative posit-ions indicated in Fig. 5. When the headed can has been removed and a new work unit positioned, the operator grasps the arm or lever 42 and swings the same to the position indicated by the dotted lines in Fig. 4. This brings the first of thetseries of teeth on the ratchet again into engagement withthe pawl 41, and when the arm or lever 42 is now swung back to its initial position thearms of the yoke 28 will slip on the sleeve 27 which is checked against movement in this direction. Properly assembled can parts having been positloned in the interim, the automatic step-by-step rotation of the sleeve 27 is now repeated and another seammg operation performed.

The machine of my invention is provided with the usual supporting platform for the can parts which is vertically reciprocable to raise the positioned work unit to engagement with the chuck and lower the headed can therefrom. I have shown this platform in the form of a disk 43 having a hub 44 secured at the upper end of a vertical shaft 45 (dotted lines, Fig. 1) which has bearings in the lowest cross-bar 14 in which it is both rotatable and slidable. At the lower end of the shaft 45 is mounted the gear 46 the teeth of which are in mesh with the teeth of a pinion 47 mounted on the lower end of the shaft 37. The gears 46 and 24 are of equal pitch, as are the pinions 47 'and 38, wherefore 1t Will be apparent that upon rotation of the driving-shaft 18 the shafts 45 and 23, and therefore the platform 43 and the chuck. 22, will be constantly rotated at equal velocities. The hub 44 of the platform-disk 43 rests-preferablythrough the interposition 100 of suitable anti-friction devicesupon a collar 48 loose on the shaft 45, which collar, in turn, rests upon a boss 49 on the cross-bar 14. The lower face of the collar 48 is provided with cam surfaces'cooperating im a 105 common and well known manner with complemental cam surfaces at the upper end of the boss 49 (as shown and described in my co-pending application aforesaid) to raise and lower said collar 48 upon rotation thereof, in one direction or the other. Projecting to accessible position from the collar 48 is the arm or lever 50, and it will be" apparent that a work unit having been positioned on the platform 43, the arm or lever 50 may be swung to rotate the collar 48 and raise said platform and therewith said work unit to engagement with the chuck 22.

collars 53 and 54 at the ends of said rods or posts, respectively.

As is the case with the machine of my co-. pending application aforesaid, I prefer that the machine of this application be adapted to be mounted for operation on the edge of a table or bench top, or similar support, and for this purpose I have shown a common and Well known type of screw-clamp 55.

adapted to be rigidly and removably secured to a support 56 of a character such as that to which I have referred. To the end of the wing or bracket 57 of the clamp is secured the cross-bar 13 of the frame through which the entire machine is supported.

From the foregoing description it Wlll be seen that whether the wheel 19 is rotated continuously or intermittently, reciprocating movement of the seaming rollers is checked when they have reached maximum distances from the chuck, allowing more or less time, as may be required or desired, for the removal of the headed can and the positioning of a new work unit. Immediately following the proper positioning of a new Work unit, the rollers may be rapidly returned to effectively operative positions, this operation automatically reestablishing connections with the driving element for the performance of the next succeeding heading operation.

Many modifications of minor details of my improved can heading machine will doubtless readily suggest themselves to those skilled in the art to which it appertains, and I therefore do not desire to limit my invention to the specific construction herein shown and described.

I claim:

1. In a machine of the character described, the combination, with means for supporting the assembled parts of a can to be headed, a seaming roller, and means for effecting relative rotary movement between said roller and the portions of the supported can parts to be joined, of means for advancing and retracting said roller to and from effectively cooperative positional relation to said supporting means, said advancing and retracting means including a connection effective throughout a portion only of a cycle of operations, and means manually operable to complete each cycle and restore effectiveness of said connection.

2. In a machine of the character described, the combination, with means for supporting the assembled parts of a can to be headed, a plurality of seaming rollers, and means for effecting relative rotary movement between said rollers and the portions of the supported can parts to be joined, of means for advancing and retracting said rollers successively to and from effectively cooperative positional relation to said supporting means, said advancing and retracting means including a'connection effective throughout a portion onl of a cycle of operations, and means manua 1y operable to complete each cycle and restore effectiveness of said connection.

3. In a machine of the character de-' scribed, the combination, with means for supporting the assembled parts of a can to be headed, a seaming roller, and means for effecting relative rotary movement between said roller and the portions of the supported can parts to be joined, of means for advancing and retracting said roller to and from effectively cooperative positional relation to said supporting means, said means for effecting relative rotary movement and said advancing and retracting means being each positively driven from common actuating 'mea'ns, means for automatically disconnecting said advancing and retracting means prior to completion of each cycle of operations thereof and when said roller.

reaches its most retracted position, and means manually operable to complete said cycle and reestablish the connection.

4:. In a machine of the character described, the combination, with means for supporting the assembled parts of a can to be headed, a plurality of seaming rollers, and means for effecting relative rotary movement between said rollers and the portions of the supported can parts to be joined of means for advancing and retracting said rollers successively to and from effectively cooperative positional relation to said supporting means, said means for effecting relative rotary movement and said advancing and retracting means being each positively driven from common actuating means, means for automatically disconnecting said advanci and retracting means prior to completion of each cycle of operations thereof and when said rollers reach their most retracted positions, and means manually operable to complete said cycle and reestablish the connection.

5. In a machine of the character described, the combination, with means for supporting and rotating the assembled parts of a can to be headed, and a roller adapted to cooperate therewith to perform the seaming operation, of means for advancing and retracting said roller, said advancing and retracting means including a connection effective throughout a portion only of a cycle of operations, and means manually operable to complete each cycle and restore effectiveness of said connection.

6. In a machine of the character described, the combination, with means for supporting and rotating the assembled parts of a can to be headed, and a plurality of rollers adapted to successively cooperate therewith to perform the seaming operation, of means for advancing and retracting said rollers said advancing and retracting" means i inc uding 'a connection efi'ective throughout aportion only'of a cycle of operations, and means manually o erable to complete eachcycle' and-restore e ectiveness of said connection;

7, 'In' a machine of the character described, the c0mbi'n'ati0n,' with means for supporting and rotating the assembled parts of a].-

can tobe head d, and a roller adapted to cooperate therewith to perform the seaming operation, of means for advancing and retracting said roller, said supporting and rotating means and said advancing and re tractlng means beingieach positively driven from common actuating means, means for automatically disconnecting-said advanci and'retracting means prior to completion 0 each cycle of o 'erations thereof and when said roller reac es its mostretracted position," and means; manually operable to com'- plete said cycle and reestablish the connection. ,1 '8. In a machine of the character described,

the combination, vwith means forsupporting I and rotating. the assembled parts of a canto be headed, and a pl'irality of seaming roll ers adapted to successively cooperate there with to perform the seaming operation, of

means for advancing and retracting said rollers, said supporting and rotating means and said advancing and retracting means being each positive y driven from common actuating means, means for automatically disconnecting saidadvancing and retracting means prior to'completion of each cycle of operations thereof and when said rollers reach their most retracted positions, *and means manually operablevto complete said cycle and reestablish the connection.

-9. In a machine of the character described,

' the combination, with means for supporting the assembled parts of acan to be headed, a seaming roller, and means for effecting rela tive rotary movement between said roller and the portions of the supported can parts to be joined, oi means for advancing and retracting said roller to and from efi'ectively cooperative positional relationto said supporting means, said advancing and retracting means including a connection effective throughout a portion only of a cycle 1 of operations and operating at comparatively low speed, and means operable at comparatively high speed to complete each cycle and restore effectiveness of said connection.

10. In a machine of the character described, the combination, with means for supporting the assembled parts of a can to be headed, a seaming roller, and means for efi'ecting relative rotary movement between said roller and the portions of the supported can parts to'bejoined, of means for advanciriiig and retracting said roller to and from c ectively cooperative positional relation to and means for effecting relative rotary imiove ment between saidrollers and the portlons of the" supported can parts to be oined, of means for'advancing and retract- .ing sa d rollers successively to and from ef- 'fecti'vely cotiperative positional relation to sald' supporting nneans, means for automatically disconnecting, said advancing and re-; tracting means prior to completion of each cycle of operations't'hereof and when said rollers reach their most retracted positions, sa1d advanclngand retracting means operatmg at comparatively low speed, and means operable at comparatively high speed to complete each cycle and reestablish the connection. I 12. In a machine of the character described, the combination, with means for supporting the assembled parts of a can to be headed, a plurality ofseaming rollers, and means for effecting relative i rotary movement between said rollers and the portions ofthe supported can parts to be joined, of means for advancing and retracting said rollers-successively to and from effectively cooperative positional relation to said supporting means, means for automatically disconnecting said advancing and retracting- 4 means prior to completion of each cycle of operations thereof and when said rollers, reach their most retracted positions, said advancing and retracting means operating at comparatively low speed, and means manually operable at comparatively high speed to complete each cycle and reestablish the concluding a connection effective throughout a portion of a cycle of operations, and means manually operable to complete each cycle and restore effectiveness of said connection.

shaft, connecting means betweensaid sleeve and said rollers to advance and retract said rollers successively to and from effectlvely cooperative positional relation to said chuck upon rotation of said sleeve, means for rotating said sleeve, said sleeve rotating means including a connection effective throughout a portion only of a cycle of operations and operating at comparatively low speed, and means operable atcomparatively high speed to complete each cycle and restore effectlveness of said connection.

15. In a can heading machine, in com-. bination, a chuck, a shaft at the end of which said chuck is mounted, seaming rollers adapted to cooperatewith said chuck to perform the seaming operation, means for effecting relative rotary movement between said chuck and said rollers, a sleeve on said shaft, connecting means between said sleeve and said rollers to advance and retract said rollers successively to and from effectively cooperative positional relation to said chuck upon rotation of said sleeve, means for rotatin said sleeve, said sleeve rotating means inclu ing a connection effective throughout a portion only of a cycle of operations and operating at comparatively low speed, and means manually operable at comparatively high speed to complete each cycle and restore effectiveness of said connection.

16. In a can heading machine, the combination, with a driving element, of a chuck, a shaft at the .end of which said chuck is mounted, seaming rollers adapted to cooperate with said chuck to perform the seaming operation, means actuated from said driving element for effecting relative rotary movement between said chuck and said rollers, a sleeve on said shaft, connecting means between said sleeve and said rollers successively to advance and retract said rollers to and from effectively cooperative positional relation to said chuck .upon rotation of said sleeve, means also actuated from said driving element for rotating said sleeve, means for automatically disconnecting saidsleeve-rotating means prior to completion of each cycle of operations thereof and when said rollers reach their most retracted .positions, and meansmanually o erable to complete said cycle and reesta lish the connection.

17. In a can heading machine, the com operation, means actuated from said driving element for effecting relative rotary movement between said chuck and said rollers,

a sleeve on said shaft, connecting means between said sleeve and said rollers to advance and retract said rollers successively to and from effectively cooperative positional relation to said chuck upon rotation of said sleeve, means also actuated from said'driving element for rotating said sleeve, means for automatically disconnecting said sleeverotating means prior to completion of each cycle of operations thereof and when said rollers reach their mostretracted positions, and means operable to complete said cycle and reestablish the connection.

18. In a can heading machine, the combination, with a driving element, of a chuck, a shaft at the end of which said chuck is mounted, seaming rollers adapted to cooperate with said chuck to perform the seaming operation, means actuated from said driving element for effectin relative rotary movement'between said c uck and said rollers, a sleeve on said shaft, connectin means between said sleeve and said r0 lers to advance and retract said rollers successively to and from effectively cooperative positional relation to said chuck upon rotation of said sleeve, means also actuated from said driving element for rotating said sleeve, said sleeve-rotating means including a connection effective throughout a portion only of a cycle of operations and operating at comparatively low speed, and means manually operable at comparatively high speed to complete each cycle and restore effectiveness of said connection.

19. In a can heading machine, the combination of a-chuck, a shaft at the end of which said chuck is mounted, seaming rollers adapted to cooperate with said chuck to perform the seaming operation, means for rotating said shaft, a sleeve on said shaft, connecting means between said sleeve and said rollers to advance and retract the latter to which said chuck is mounted, seaming rollers adapted to cooperate with said chuck to perform the seaming operation, means for rotating said shaft, a sleeve on said shaft, connecting means between said sleeve and said rollers to advance and retract the latter successively upon rotation of said sleeve, means for rotating said sleeve independently of said shaft, said sleeve-rotating and from said chuck upon rotation of said means including a connection effective throughout a portion only of a cycle of operations and operating at comparatively low speed, and means operable at comparatively high speed to complete each cycle and restore effectiveness of said connection.

21. In a can heading machine, the combination of a chuck, a shaft at the end of which said chuck is mounted, seaming rollers adapted to cooperate with said chuck to perform the seaming operation, means for rotating said shaft, a sleeve on said shaft, connecting means between said sleeve and said rollers to advance and rot act the latter successively to and from said chuck upon rotation of said sleeve, .means for rotating said sleeve independently of said sleeve-rotating means including a connection effective throughout a portion only of a cycle of operations and operating at comparatively low speed, and means manually operable at comparatively high speed to complete each cycle and restore effectiveness of said connection.

22. In a can heading machine, the combination, with a driving element, of a chuck, a shaft at the end of which said chuck is mounted, seaming rollers adapted to cooperate with said chuck to perform the seaming operation, means actuated from said driving element for rotating said shaft, a sleeve on said shaft, connecting means between said sleeve and said rollers to advance and retract said rollers successively to and from said chuck upon rotation of said sleeve, means also actuated positively frorfi said driving element for rotating said sleeve independently of said shaft, means for automatically disconnecting said sleeve-rotating means prior to completion of each cycle of operations thereof and when said rollers reach their most retracted positions, and means manually operable to complete said cycle and reestablish the connection.

23. In a can heading machine, in combination, a chuck, a shaft at the end of which said chuck is mounted, seaming rollers adapted to cooperate with said chuck to per form the seaming operation. means for effecting relative rotary movement between said chuck and said rollers, a sleeve on said shaftf connecting means between said sleeve and said rollers to advance and retract said rollers to and from said chuck upon rotation of said sleeve, means for rotating said sleeve, said means comprising a reciprocating 'pawland a mutilated ratchet on said sleeve whereby pawl driven movement of said sleeve is less than one revolution thereof, and means for continuing movement of said sleeve to complete one revolution thereof and bring the teeth thereof again into engagement with said pawl.

24. In a can heading machine, in combination, a chuck, a shaft at the end of which said chuck is mounted, seaming rollers adapted to cooperate with said chuck to perform the seaming operation, means for effecting relative rotary movement between said chuck and said rollers, a sleeve on said shaft, connecting means between said sleeve and said rollers to advance and retract said rollers to and from said chuck upon rotation of said sleeve, means for rotating said sleeve, said means comprising a reciprocating pawl and a mutilated ratchet on said sleeve whereby pawl-driven movement of said sleeve is less than one revolution thereof, and means manually operable at will for continuing movement of said sleeve to complete one revolution and bring the teeth thereof again into engagement with said pawl.

25. In a can heading machine, in combination, a chuck, a shaft at the end of which said chuck is mounted, seaming rollers adapted to coiiperate with said chuck to perform the seaming operation, means for rotating said shaft, a sleeve loose on said shaft, connecting means between said sleeve and said rollers to advance and retract the latter to and from said chuck upon rotation of said sleeve, means for rotating said sleeve independently of said shaft, said means comprising a reciprocating pawl and a mutilated ratchet on said sleeve whereby pawl-driven movement of said sleeve is less than one revolution, and means for continuing movement of said sleeve to complete one revolution and bring the teeth thereof again into engagement with said pawl.

26. In a can heading machine,in combination, a chuck, a shaft at the 'end of which said chuck is mounted, seaming rollers adapted to cooperate with said chuck to perform the seaming operation, means for rotating said shaft, a sleeve loose on said shaft, connecting means between said sleeve and said rollers to advance and retract the latter to and from said chuck upon rotation of said sleeve, means for rotatlng said sleeve independently of said shaft, said means comprising a reciprocating pawl and a mutilated ratchet on said sleeve whereby pawl-driven movement of said sleeve is less than one revolution, and means manually operable at will for continuing movement of said sleeve to complete one revolution and bring the teeth thereof again into engagement with said pawl. I

In testimony of the foregoing, I have hereunto set my hand in the presence of two witnesses.

JULIUS BRENZINGER.

Witnesses i Tnro'rHYA. EIGO, ROBERT E. DOUGLAS. 

